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Wetlands have many functions that are beneficial. This module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion.4  wetlands provide food and habitat.5  wetlands save people money.his module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion. 4  wetlands provide food and habitat.
What is a Wetland? Wetland Components. Wetlands are areas where water covers the soil, or is present either at or near the surface of the soil all year or for varying periods of time during the year, including during the growing season.